fn main() {
    println!("Hello, world!");
    let long_lived_binding = 1;
    {
        let short_lived_binding = 2;
        println!("inner short :{}", short_lived_binding);
        let long_lived_binding = 5_f32;
        println!("inner long :{}", long_lived_binding);
    }
    // println!("outer short:{}", short_lived_binding);
    println!("outer long:{}", long_lived_binding);
    let long_lived_binding = 'a';
    println!("outer long:{}", long_lived_binding);
}
